静电的KVS子单元与大脑中的本地KV2通道联系在一起,并影响通道功能的各种特性
Michael Ferns1,2, Deborah van der List2, Nicholas C Vierra2
1Dept. of Anesthesiology and Pain Medicine, University of California Davis, One Shields Ave, Davis, CA 95616, USA.
bioRxiv : the preprint server for biology
|February 8, 2024
概括
Kv5.1亚单元是原生大脑Kv2通道的关键组成部分,影响神经元刺激性和ER-PM连接. 它的存在改变了Kv2通道集群和药理学.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 离子通道生理学 离子通道生理学
背景情况:
- Kv2家族的电压关闭的K+通道对神经元功能至关重要,调节激发能力和组织内质网膜-血膜 (ER-PM) 结合.
- 众所周知,Kv2.1和Kv2.2α子单元与"电静"的KvS子单元组合在一起,形成具有独特生物物理性质的异构道.
研究的目的:
- 为了识别特定的kvS子单元,这些kvS子单元与老鼠大脑中的Kv2.1通道相关联.
- 研究Kv5.1亚单元融入本源Kv2通道的功能和亚细胞影响.
主要方法:
- 基于质谱的蛋白质组学被用来识别来自小鼠大脑的免疫净化Kv2.1通道相关的KvS子单元.
- 共同免疫沉试验用于确认Kv5.1,Kv2.1和Kv2.2在脑溶解物中的相互作用.
- 在动物大脑部分进行了多重免疫光标记,以确定Kv5.1与Kv2.1和Kv2.2在神经元中的同定位.
- 异质细胞表达系统被用来研究Kv5.1联合表达对Kv2.1通道聚类和药理学的影响.
主要成果:
- 五个KvS子单位被确定为本地Kv2.1通道的组件,其中Kv5.1是最丰富的.
- 发现Kv5.1与Kv2.1和Kv2.2在大脑溶解物中共同免疫,其蛋白质水平在Kv2.1淘汰赛模型中显著降低.
- 在皮层神经元的ER-PM连接处,Kv5.1与Kv2.1和Kv2.2共同聚集,尽管Kv5.1含有的通道与同质的Kv2通道相比显示了较少的聚集.
- 在异质细胞中,Kv5.1的共同表达减少了Kv2.1通道聚类,并改变了其药理特性.
结论:
- 电静的Kv5.1子单元是本地大脑Kv2通道的重要部分的组成部分.
- 将Kv5.1纳入异构Kv2通道影响了通道聚类和药理特征,这表明它在调节神经元功能方面发挥了作用.
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